I haven’t come across anything specifically discrediting Session or Oxen. However, I'm not a fan of the app: it lacks PFS and is backed by an Australian company. I would recommend using Threema or Signal instead, simply and only because I prefer them over Session. For those particularly concerned about anonymity, consider using these apps over TOR. This setup offers benefits similar to Session, utilizing an Onion network for an added layer︀ of privacy.
This is the most︂ complete overview of messaging apps I have encountered so far, thanks for sharing!
Amdocs being involved made me lol, given their role in numerous critical systems. That said, concerns︅ persist about Matrix, especially with ongoing privacy issues. Despite efforts to enhance privacy, progress has︆ been slow and continuous since 2018. Here’s more on their updates:
[WIP] MSC1228: Removing MXIDs︇ from events by richvdh · Pull Request #1228 · matrix-org/matrix-spec-proposals.
When choosing a messaging︈ app, consider how you’ll use it. For general privacy-preserving communication, I recommend Signal or Threema.︉ Session might also work, depending on your needs. For a tightly controlled environment with trusted︊ contacts, consider Matrix + Client or XMPP. Other commercial solutions like AWS Wickr and Threema︋ on-premise can also be adapted for secure settings. You would have to run it yourself,︌ but you're then able control the network and access to the applications.
The most important︍ part however remains the hygiene of your devices. Even the best app can't protect your︎ communications on a compromised device. Opt for devices that get regular updates, have strict security️ settings, and perhaps additional monitoring capabilities. A well-configured device like a recent iPhone significantly reduces the risk of message interception, regardless of whether you use Telegram, Session, or Signal.